Process for producing a separable multiply sheet and product thereof



L. KIWSSCZFPMAUN ROCLSS FOR PRODUCING A SEPARABLE NULIIPLY SHEET ANB PHGT THXKEQ Filed JmL E3 u l Patented Nov- PATENio FFicE;

LESTER KIRSCHBRAUN, oF ci-ricaeo, lILLINOIS. Y

.tenant rnociiss Fon rnonUcINe A sEgPAaABLE MULTIPLY smania Aiiiirn rRoDuo'r annexion;

` Application led January 23, 1925. Serial No. 4,169.

This invention relates to improvements in process for prod'ucinga waterproof multiply sheet of fibrous material and product there of, and refersjmore particularly to the idea of. interposing a layeror film of a non- Sticky material between opposed plies or layers of fibrous stock in which has been in` corporated a waterproofing material simultaneously with formation. The composite sheet is ressed and dried in the usual manner, andp subsequently separated or divided along the line of the film of non-adhesive material. l

l Briefly describing the invention, it may be as follows: A multiply sheet maybe built up .on the Vcylinder molds of a multi-cylinder tainers having baffles 5, 6, 7 and 8.

machine in such a manner that theoutside plies may consist of fibrous stock which may of course, vbe mixed-with a waterproofing material and inner plies of fibrous stock containing the waterproofing material. also during such formation of the multiply sheet, a layer or film of noneticky or nnadhesive material such as a pulverulent material in an aqueous vehicle may be interposed between the opposed layers'of waterproof-containing stock to prevent the adJacent plies of such stock from cohering with each other to form a unitary structure.

In the drawings, 1 is a diagrammatic side .elevational view of apparatus by which my invention may be carried out.

Fig. 2 is an enlarged cross sectional view of the composite multiply sheet producedin accordance with' my invention.

Referrin in detail to the drawings, 1, 2, 3 and 4 designate the usual vats or pulp con- 1 Adapted to rotate within the vats 1, 2, 3fand 4 are the cylinder molds 9, 10, 11and 12 mounted on the shafts 13, 14, 15 and16.

The fibrous pulp is introduced into the vats in the conventional manner, so that each cylinder mold is supplied with stock from which to form a web, The stock supplied to the outside vats l, 2, 3 and 4 is the usual paper stock, while-that supplied to the inside vats 21 and 22 having bafiies 23 and 24, contains admixed waterproofing material in non-adhesive emulsion form. This latter is powdered, and introduced with the pulp in accordance with my previous issued United States Patent No. 1,302,810. There will therefore lbe formed on molds 25 and 26 mounted' on shafts 27 and 28, a webV of waterproof-containing stock which" will drying, will form waterproof ply.

Referring now to one 21 and 22 is a container 29 in which is adaptedrto be placed a non-adhesive, irons sticky material which may for. instance, be an aqueous suspension other non-sticky material. roll 30 keyed on shaft 31 is preferably a hollow wire shell ffuapted` to be rotated within the body of noii-eticky material in container 29 carrying upwardly a thin film or layer of this non-sticky material on the surface of this'roll, as will 4hereafter eX- plained.

The application The roll 30, as explained, is adapted tobe driven yby means o it from cylinder molds variations of power transmitted to or couch rolls so that speed will fellow at the same rate as any-variations in the rate of formalm or layer of of the features of. `the present invention, intermediate the vats l.be united to the adjacent Webs-aIld-up-On powder, or any preferably in u be carried uptacting roll 3b is offset and maintains at all times a constant tension to avoid flapping of the sheet, and is adjustable to bring the felt into carefully regulated contact with roll 30. Y

After passing over the cylinder mold 11, the composite sheet is carried by blanket 32 through .the usual press equipment of the well known cylinder-machine, and passed over the dryers 38 and calender rolls 39, after which the sheet may be mechanically separated or divided along the line of the film of non-sticly material into separate sheets 40 and 41, each of which will carry a waterproofed ply on one surface thereof.

'he detailed construction ofthe sheet wi the -plies waterproofing .materiaL plies of fibrous stock may understood of course, v

Utl

be vseen more clearly by reference to Fig. 2, in which 42v designates the outside plies *nay i iio material and 44 designates the independent` film or layer of non-sticky material. The

dotted line A-A designates the line of division.

It is to be understood of course,'that any number of plies containing waterproofing material may be interposed, and of course, it follows that any number of layers of nonsticky material may be used. The function of the thin layer or film of non-sticky ma` terial is that it is to be used as a parting medium, and a plurality of sheets can be simultaneously formed by means of the present invention, and later separated or divided to provide sheets having surface plies containing waterproofing material after separation, without contacting with the felts or blankets of the multi-cylinder machine.

I aml aware that heretofore, attempts have been made to introduce a partin 3 medium between fibrous plies of a mu tiply sheet produced onamulti-cylinder machine, and that said composite sheet has been later separated at the dry end, to Iform a plurality of individual sheets, the object being to produce wall paper having rough finish. `The difference between the prior art, and the present invention is immediately obvious, and needs no further explanation.

In accordance with the present invention, the non-sticky parting medium instead of being applied in a suspension, may be applied in the form of a substantially dry powder projected onto the wet sheet in any desired manner, for instance, by means of air. Waterproofing material,preferably in emulsion form, .may be introduced into the vats 21 and 22 without the addition of any fibre and films of waterproof material minus fibre carried up on the mold and applied to adjacent fibrous webs. In order to do this, these molds must be shut off from the rest of the system, the couch rolls raised and offset so as to provide contact similar to that referred to in connection with roll 30, and the cylinder molds must bey independently driven from some other part of the machine.

The waterproofing material will comprise fusible pitches, such as asphalts, resins and the like. v

I claim as my invention:

l. A process of the character described, consisting in forming a multiply sheeton a lpaper-machine, introducing in certain limer Y plies simultaneously with their formation into a united sheet fusible Waterproofing material, and interposing between the waterproofed inner plies an independent layer of non-adhesive material functioning as a parting medium.

2. A process 'of the character described, consisting in forming a multiply sheet on a paper machine, introducing into predetermined inner plies simultaneously with their formation into a united sheet, fusible pitchy waterproofing material in non-adhesive form and interposing between the waterproofed plies an independent layer of nonsticky material functioning as a parting medium. 76

3. A process of the character described, consisting in forming a multiply sheet on a paper machine, introducing into predetermined inner plies simultaneously with their formation into a united sheet, fusible water- 80 proofing material and interposing between A certain of the waterproofed inner plies an independent layer of non-adhesive parting material, passing the united sheet over dryers and then separating the united sheet along the line of the non-adhesive parting material to produce separate sheets containing waterproofing material on the then outer surface.

' 4. A multiply sheet formed on a paper 90 machine, comprising a plurality of -outer plies of simultaneously felted fibrous stock having inner plies containing fusible waterproofing material and a film of non-adhesive material interposed between the waterproofed' plies functioning as a parting medium.

5. A multiply sheet formed on a paper machine, comprising a plurality of outer plies of simultaneously felted fibrous stock 100 having inner plies containing fusible waterproofing material and a film of non-adhe-i sive material interposed between the' waterproofed plies functioning as a, parting medium. i

6. A multiply sheet formed on amulticylinder machine, comprising a plurality of outer plies of simultaneously felted fibrous stock having inner plies of fusible waterproofing material and a film of non-adhesiven parting material interposed between the waterproofed plies, said multiply sheet being adapted to be separated along the line of the layer of non-adhesive parting material, into individual sheets, each sheet then having an outer ply'containing waterproofing material.

- LESTER KIRSCHBRAUN. 

